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Add support for compression type 0x15 #19

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Add support for compression type 0x15 #19

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7 changes: 7 additions & 0 deletions jefferson/compression/jffs2_lzma_0x15.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
import lzma

def decompress(data, outlen):
lzma_header = data[0:5]
lzma_data = data[0:5] + outlen.to_bytes(8, "little") + data[5:]
decompressed = lzma.decompress(lzma_data)
return decompressed
4 changes: 4 additions & 0 deletions jefferson/jffs2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
from lzallright import LZOCompressor as lzo

import jefferson.compression.jffs2_lzma as jffs2_lzma
import jefferson.compression.jffs2_lzma_0x15 as jffs2_lzma_0x15
import jefferson.compression.rtime as rtime


Expand All @@ -30,6 +31,7 @@ def PAD(x):
JFFS2_COMPR_ZLIB = 0x06
JFFS2_COMPR_LZO = 0x07
JFFS2_COMPR_LZMA = 0x08
JFFS2_COMPR_0x15_LZMA = 0x15

# /* Compatibility flags. */
JFFS2_COMPAT_MASK = 0xC000 # /* What do to if an unknown nodetype is found */
Expand Down Expand Up @@ -181,6 +183,8 @@ def unpack(self, data):
self.data = jffs2_lzma.decompress(node_data, self.dsize)
elif self.compr == JFFS2_COMPR_LZO:
self.data = lzo.decompress(node_data)
elif self.compr == JFFS2_COMPR_0x15_LZMA:
self.data = jffs2_lzma_0x15.decompress(node_data, self.dsize)
else:
print("compression not implemented", self)
print(node_data.hex()[:20])
Expand Down